Electrical regulating system.



0. A. BODDIE.

ELECTRICAL REGULAHNG SYSTEM.

APPLICATION FILED APR. I1, 1916. RENEWED OCT. 1.1918- Patented Nov. 12, 1918 lml ,2, M M IV W Q 37-? /ao T] M J 1 19 E g,18 EE/BS WITNESSES INVENTOR 4 4 ATTQRNEY sufficiently low value.

UNITED :sTArEs PATENT OFFICE.

onnnnn'cn A. comma, or PITTSBURGH, IENNSYLVANIA, ASSIGNOR 'ro wns'rrivonoosn nnncrmo AND MANUFACTURING company, A CORPORATION or PENNSYLVANIA.

1,28et,574. I

Specification of Letters Patent.

ELECTRICAL RE GULA'IING SYSTEM.

Patented Nov. 12, 1918.

Application filed April 12, 1916, Serial No. 90,670. Renewed October 7, 19 18. SerlalNo. 257,273.

To all. u/wm it may concern:

Be it known that I, CLARENCE A. Become, a citizen of the United States, and a reeldent of Pittsburgh, in the county of Alle gheny and State of Pennsylvania, have in vented a new and useful lmprovement in Electrical Regulatin Systems, of which the following is a speci cation.

My invention relates to Volta e and similar regulators for dynamo-ele machines and particularly to regulatorsolthe vibrating contact type that are adapted to automatically control the effective field strengths of dynamo-electric machines.

The object of my invention is to provide a quickly and accurately responsive regulator having a broad range of regulation; viz, a range that is not limited by the residual magnetism of the dynamo-electric machine.

It is frequently desirable shall cause the voltage of an exciter for a generator or other dynamo-electric machine to vary from a comparatively high valueto substantially zero, and especially when the regulator is employed in connection with a synchronous condenser. However, this has not always been feasible because the residual magnetism in the field of the exciter has prevented the voltage from decreasing to a .Aoconhng to the present invention means are provided for overcoming the effect of residual magnetism, with the result that the regulator responds quickly and accurately to variations in the quantity regulated, and the re lator has a broad range of operation.

In fi e single figure of the accompanying drawing, which diagrammatically illustrates an electrical system embodying my inven- ,tion, a synchronous condenser 1, or other suitable dynamo-electric machine, has its armature 2 connected to a transmission-circuit 3+5 and its field-magnet winding 6 con nee-ted to the armature 7 ofancxciter 8. The exciter 8 is provided with a main fieldmagnet winding 9 that supplies the greater portion of the energy for field excitation andis here shown as connected in shout to 'thpmeitenarmature 7, though it may recelve energy from any other suitable source. Theexciter is also provided with two opposing jfield-maignetwindings 10 and 11 that receive exciting current from .a small generator 12, or that may receive it from any other suitable source,

that a regulator.

such as a storage battery. The winding 10 comprises more convolutions than the winding 11 or is otherwise arranged to roduce a larger-amount of field flux than the winding 11.

In series with the main field winding 9 and the auxiliary field winding 11 are resistors 14 and 15, respectively, the effective values of which are governed simultaneously by relays 16 and 17, respectively. The relays 16 and 17 are provi ed with energizing windings 18 and 19 that receive current from the generator 12 or from any other suitable source. The windings 18 and 19 are caused to be energized and denergized by the disengagement and engagement of a air of stationary and movable contact memers 20 and 21 that constitute parts of the main control element of a regulator 22.

The regulator comprises also a bell-crank lever 23 having a stationary fulcrum at 21 and a dependin arm 25. The arm 25 carries, and provi es :1 fulcrum at 26 for, a second lever 27 having an upwardly and laterally extending arm 28 upon which the movable contact member 21 is mounted. The arm 23 is actuated by an electromagnct 30 having a winding 31 that-receives exciting current from the circuit 3,= 4 and 5 through a transformer 32. In series with the winding 31 is a resistor 33 having the contact members of a relay 34 connected in .ceives current proportional to the voltage of the circuit 3+5, if the regulation is to be affected in accordance with variations of the said voltage. However, if desired, the lever 27 may be actuated in accordance with variations of other electrical quantities pertaining to the circuit 345, such as the current or power factor.

In theoperation of the regulator, the position of the contact terminal 21 is varied by electromagnet 37 in accordance with the voltage or other selected electrical condition of the circuit 345 and the electromagnet 30 serves to cause engagement and d senga ement of the terminal 21 with the leimina 20. When the terminals 20 and E21 engage each other, the contact terminals of the relays 16 and 17 also engage each other, and the resistors 14 and 15 are accordingly short circuited. As a result, the exciter field windings 9 and 10 have full voltage applied to them and there is a tendency of the exciter to increase its voltage to its maxi mum value. hen the contact terminals 20 and 21 are not in engagement the contact terminals of the relays 16 and 17 are also disengaged, with the result that the resistors 14 and 15 are included in circuit with the exciter field windings 9 and 10. Under this condition, the field windings 9 and 10 have the minimum voltages applied to them and there is a corresponding decrease in the exciter voltage. The values of the resistors 14 and 15 are such that, when they are included in circuit with field windings t) and 10 for a sufficient period, the auxiliary field winding 11 may force the excitcr voltage to substantially zero, or may even cause the current in the cxciter to reverse its direction of flow. The winding 11, therefore,

serves to cause a more rapid decrease in the exciter voltage and also forces it below a valuecorresponding to that which would be produced by the residual magnetism in the exciter fieldstructure. This result is, of course, rendered possible by the fact that the auxiliar field windings 10 and 11 receive current irom a source independent of the exciter. The increase in the voltage of the exciter, when the resistors 14 and 15 are shortcircuited, is also more rapid than would otherwise be the case because of the fact that the field winding 10 assists the main field winding 9 and is excited from an independent source.

I claim as my invention:

1. The combination with a dynamo-electric machine having a main old-magnet winding and "two mutually opposing auxiliary ii eld-magnet windings, of a regulator for the dynamo-electric machine comprising means for simultaneously varying the excitation of the main field-magnet wind ing and of the auxiliary field-magnet Winding that is su plementary thereto.

2. The com mation with a dynamo-electric machine having a main old-magnet winding and two mutually op osing auxiliary field-magnet windings, o a regulator "for the dynamo-electric machine comprising means for similarly and simultaneously varying the excitation of the main fieldma net winding and one of the auxiliary fielc -magnct windings.

3, The combination with a dynamo-electric machine having a main field-magnet winding and two opposing auxiliary fieldmagnet windings one of which, when fully energized,- preponderates over the other, of a regulator for the dymm'io-electric machine comprising means for simultaneously varying the excitation of the main field-magnet winding and the prepondcrating auxiliary field-magnet winding.

4. The combination with a dynamo-electric machine having a main field-magnet winding and two opposing auxiliary fieldmagnet windings one of which, when fully energized, preponderates over the other, and resistors respectively in circuit with the main and the )repondcrating auxiliary ficld'magnet windings. of a regulator for the dynamo-electric machine comprising means for simultaneously varying the effective values of the resistors.

5. The combination with a dynamo-01cc tric machine having a main field-magnet winding and two mutually opposing auxiliary field-magnet windings, and resistors respectively in circuit with the main field magnet winding and with the auxiliary field-magnet winding that is su )plcmentary thereto, of a regulator for the dynamo-electric machine comprising means for simultaneously varying the effective values of the resistors.

6. The combination with a dynamo-electric machine having a main field-magnet winding and two auxiliary field-magnet windings. and a constant source of energy for supplying the auxiliary field-magnet windings, of a regulator for the dynamoelectric machine comprising means for simultaneously varying the excitation of the main field-magnet winding and one of the auxiliary field-magnet windings.

7 The combination with a dynamo-electric machine having a main field-magnet winding and two mutually opposing auxiliary field'magnet windings, and a constant source of energy for supplying the auxiliary field-magnet windings, of a regulator for the dynamo-electric machine comprising means for simultaneously varying the excitation of the main field-magnet winding and one of .the auxiliary field-magnet windings.

In testimony whereof, I have hereunto subscribed my name this 31st day of March CLARENCE A. BODDIE. 

